1. Otto   Rabies Vaccine   Bakelite   Airship (rigid)   Internal Combustion Engine   Hint Half-n-half Clue   2. Sir Frank Whittle   Logarithmic Tables   Shorthand   Jet Engine   Refrigerator   Half-n-half Clue   3. Roger Bacon   Jet Engine   Gunpowder   Power Loom   Bicycle   Half-n-half Clue   4. Gottlieb Daimler   Ball-Point Pen   Carburettor   Submarine   Bicycle   Half-n-half Clue   5. Dr. Alan M. Turing   Carburettor   Electronic Computer   Rabies Vaccine   Microscope   Half-n-half Clue   6. Leo H Baekeland   Bakelite   Carburettor   Power Loom   Ball-Point Pen   Half-n-half Clue   7. Evangelista Torricelli   Refrigerator   Transistor   Barometer   Gunpowder   Half-n-half Clue